摘要：5．下列各因式分解正确的是 A. x2 + 2x -1=(x - 1)2 B. - x2 +(-2)2 =(x - 2)(x + 2) C. x3- 4x = x(x + 2)(x - 2) D. (x + 1)2 = x2 + 2x + 1

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